FreeLAN - the multiplatform VPN-client who extends under licence GNU GPL and concerns so-called class Full Mesh, that is uses P2P-technologies. The project concerning young, has actively started to move ahead only since 2013. Its main difference from other projects is a choice of an architectural option: client server (as habitual VPN, clients depending on installations can or cannot exchange the data with each other, the server can act as relays), P2P (clients are connected to each other directly) and mixed (both variants).

WireGuard - result of researches of the author of the project of Jayson Donenfilda (Jason A. Donenfeld), heads of company Edge Security. A product with the built in cryptography, simultaneously idle time in use and in realisation (hardly more than 4000 lines of a code) that essentially allocates it among other decisions. For example, its code is easier to analyse, than everything that is written in frameworks *Swan/IPsec or OpenVPN.

SoftEther VPN - the academic project of Japanese university (University of Tsukuba), extended under licence GPLv2. Its main feature is support of the several VPN-reports compatible to original clients. It allows instead of park of servers from proprietary and open source decisions to use for connection of the clients working under control of different OS, one application. And simply to choose the necessary report depending on a concrete situation.